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+//
+// detail/posix_event.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_POSIX_EVENT_HPP
+#define ASIO_DETAIL_POSIX_EVENT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#if defined(ASIO_HAS_PTHREADS)
+
+#include <pthread.h>
+#include "asio/detail/assert.hpp"
+#include "asio/detail/noncopyable.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class posix_event
+ : private noncopyable
+{
+public:
+ // Constructor.
+ ASIO_DECL posix_event();
+
+ // Destructor.
+ ~posix_event()
+ {
+ ::pthread_cond_destroy(&cond_);
+ }
+
+ // Signal the event. (Retained for backward compatibility.)
+ template <typename Lock>
+ void signal(Lock& lock)
+ {
+ this->signal_all(lock);
+ }
+
+ // Signal all waiters.
+ template <typename Lock>
+ void signal_all(Lock& lock)
+ {
+ ASIO_ASSERT(lock.locked());
+ (void)lock;
+ state_ |= 1;
+ ::pthread_cond_broadcast(&cond_); // Ignore EINVAL.
+ }
+
+ // Unlock the mutex and signal one waiter.
+ template <typename Lock>
+ void unlock_and_signal_one(Lock& lock)
+ {
+ ASIO_ASSERT(lock.locked());
+ state_ |= 1;
+ bool have_waiters = (state_ > 1);
+ lock.unlock();
+ if (have_waiters)
+ ::pthread_cond_signal(&cond_); // Ignore EINVAL.
+ }
+
+ // If there's a waiter, unlock the mutex and signal it.
+ template <typename Lock>
+ bool maybe_unlock_and_signal_one(Lock& lock)
+ {
+ ASIO_ASSERT(lock.locked());
+ state_ |= 1;
+ if (state_ > 1)
+ {
+ lock.unlock();
+ ::pthread_cond_signal(&cond_); // Ignore EINVAL.
+ return true;
+ }
+ return false;
+ }
+
+ // Reset the event.
+ template <typename Lock>
+ void clear(Lock& lock)
+ {
+ ASIO_ASSERT(lock.locked());
+ (void)lock;
+ state_ &= ~std::size_t(1);
+ }
+
+ // Wait for the event to become signalled.
+ template <typename Lock>
+ void wait(Lock& lock)
+ {
+ ASIO_ASSERT(lock.locked());
+ while ((state_ & 1) == 0)
+ {
+ state_ += 2;
+ ::pthread_cond_wait(&cond_, &lock.mutex().mutex_); // Ignore EINVAL.
+ state_ -= 2;
+ }
+ }
+
+ // Timed wait for the event to become signalled.
+ template <typename Lock>
+ bool wait_for_usec(Lock& lock, long usec)
+ {
+ ASIO_ASSERT(lock.locked());
+ if ((state_ & 1) == 0)
+ {
+ state_ += 2;
+ timespec ts;
+#if (defined(__MACH__) && defined(__APPLE__)) \
+ || (defined(__ANDROID__) && (__ANDROID_API__ < 21) \
+ && defined(HAVE_PTHREAD_COND_TIMEDWAIT_RELATIVE))
+ ts.tv_sec = usec / 1000000;
+ ts.tv_nsec = (usec % 1000000) * 1000;
+ ::pthread_cond_timedwait_relative_np(
+ &cond_, &lock.mutex().mutex_, &ts); // Ignore EINVAL.
+#else // (defined(__MACH__) && defined(__APPLE__))
+ // || (defined(__ANDROID__) && (__ANDROID_API__ < 21)
+ // && defined(HAVE_PTHREAD_COND_TIMEDWAIT_RELATIVE))
+ if (::clock_gettime(CLOCK_MONOTONIC, &ts) == 0)
+ {
+ ts.tv_sec += usec / 1000000;
+ ts.tv_nsec = (usec % 1000000) * 1000;
+ ts.tv_sec += ts.tv_nsec / 1000000000;
+ ts.tv_nsec = ts.tv_nsec % 1000000000;
+ ::pthread_cond_timedwait(&cond_,
+ &lock.mutex().mutex_, &ts); // Ignore EINVAL.
+ }
+#endif // (defined(__MACH__) && defined(__APPLE__))
+ // || (defined(__ANDROID__) && (__ANDROID_API__ < 21)
+ // && defined(HAVE_PTHREAD_COND_TIMEDWAIT_RELATIVE))
+ state_ -= 2;
+ }
+ return (state_ & 1) != 0;
+ }
+
+private:
+ ::pthread_cond_t cond_;
+ std::size_t state_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/detail/impl/posix_event.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // defined(ASIO_HAS_PTHREADS)
+
+#endif // ASIO_DETAIL_POSIX_EVENT_HPP